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Waveshare Dual Ethernet Ports 8-ch Relay Module C Modbus RTU Protocol PoE Power

Waveshare Industrial Modbus RTU 8-ch Relay Module (D) With Digital Input RS485

DC 5-40V 4-bit LED Modbus Rtu Rs485 temperature and humidity sensor acquisition

Welch Allyn Protocol 503-0054-02 Medical Power Adapter for Patient Monitor